985547721 has 4 divisors (see below), whose sum is σ = 1314063632. Its totient is φ = 657031812.

The previous prime is 985547711. The next prime is 985547743. The reversal of 985547721 is 127745589.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 985547721 - 2⁹ = 985547209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (985547711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164257951 + ... + 164257956.

It is an arithmetic number, because the mean of its divisors is an integer number (328515908).

Almost surely, 2^985547721 is an apocalyptic number.

It is an amenable number.

985547721 is a deficient number, since it is larger than the sum of its proper divisors (328515911).

985547721 is a wasteful number, since it uses less digits than its factorization.

985547721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328515910.

The product of its digits is 705600, while the sum is 48.

The square root of 985547721 is about 31393.4343613438. The cubic root of 985547721 is about 995.1591779208.

The spelling of 985547721 in words is "nine hundred eighty-five million, five hundred forty-seven thousand, seven hundred twenty-one".